How do you heat precooked prime rib?

The best way to heat precooked prime rib is to cook it in an oven on low temperature settings for a few hours, until an internal temperature of at least 135 degrees Fahrenheit is reached. Precooked prime rib can be from leftovers or purchased at a convenience food.

For packaged precooked prime rib, follow a couple of steps to get the meat up to temperature.

1. Preheat the over and prepare the prime rib
Preheat the oven to 300 F. Remove the prime rib slices or roast from its packaging and rewrap in aluminum foil.
2. Cook to desired doneness
Place the prime rib and cook for at least 2 1/2 hours. For medium-rare prime rib, remove from the oven once the meat reaches 135 F, using a meat thermometer.